1 Kings 2:46

2:46 The king then gave the order to Benaiah son of Jehoiada who went and executed Shimei. 1 

So Solomon took firm control of the kingdom. 2 

1 tn “The king commanded Benaiah son of Jehoiada and he went out and struck him down and he died.”

2 tn “And the kingdom was established in the hand of Solomon.”